Marker for lathes and the like.



R F. BRACKE.

MARKER FOR LATHES AND THE LIKE.

APPLICATION FILED MAY 3. 1915.

1,220,597., Patented Mar. 27, 1917.

2 SHEETS-SHEET I.

365% G I flake/'3 FBr-acka M W M flmrizeya rsns ca nwmunm. vasmm; mm oc.

R. F. BRACKE.

MARKER FOR LATHES AND THE LIKE.

APPLICATION FILED MAY 3, 1915.

1,220,597. Patented Mar. 27, 1917.

2 SHEETS-SHEET 2- A, if E TED TAETES PATENT @FFIQE ROBERT F. BRACKE, OFCHICAGO, ILLINOI$, AQSIGNCE OF ONE-THIRD TO ALBERT G. IVIGCALEB ANDONE-THIRD TO ALBIN C. AI-ILIBERG, BOTH OF CHICAGO, ILLINOIS.

MARKER FOR LATI-IES AND THE LIKE. v

Specification of Letters Patent. Patented lVIEtl. 27, 1917.

Application filed May 3, 1915. Serial No. 25,421.

To all whom it may concern:

Be it known that I, ROBERT F. BRACKE, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Markers for Lathes andthe like, of which the following is a full, clear, concise, and eXactdescription, reference being had to the accompanying drawings, forming apart of this specification.

My invention relates to markers for lathes and the like, and has for itsobject the provision of a device of this class which can be economicallymanufactured; one which is thoroughly accurate in its operation; onewhich can be easily and quickly handled or operated by the workman, andwhich is compact in construction.

The device of my invention is adaptedfor use particularly in connectionwith lathes, although its use need not be so limited. Generally, thedevice consists of a marking tool arranged to be carried when used inconnection with a lathe, by the tool post of the same. The tool post, asis well known in the art, is mounted upon the lathe carriage which isarranged to be moved on the bed of the lathe ina longitudinal ortransverse direction by the manipulation of suitable handles or cranksusually provided on the front face of the carriage apron. By thisarrangement, it will readily be seen that the tool post and thus themarker carried thereby, can be adjusted to any desired position toeffect the marking of the work. To determine the position of the markerfrom some point or position on the work, I provide a scale graduatedinto inches or centimeters slidably mounted on the marker carried by thetool post. This scale is preferably provided with an inwardly extendingprojection, which is arranged to engage the face of the work to bemarked, as for instance the end face adjacent the tail stock, when thelathe is set to hold a piece of work upon the head stock spindle and thetail stock spindle. The scale is preferably frictionally held in themarker so that it will be retained in any position to which it may bemoved.

In effecting the marking of a plece of work, the work may be supportedby the lathe spindles in the usual manner and the marker inserted intothe tool post. The

scale projection above referred to is then moved into engagement withone of the edges of the work, and the tool marker per so moved in adirection away from the projBCt-IOH until the same assumes a positionwhere it is desired to effect the marking. This position is determinedby the graduations carried by the scale and anindeX, carried by the toolmarker; the movement of the marker, of course, being effected by thelongitudinal hand feed provided on the carriage. After the marker hasbeen thus positioned, the same is caused to engage the work by operatingthe cross feed handle of the apron to cause engagement of the cutting ormarking edge of the marker with the work. The work may then be rotatedby hand to produce the marking, or a driving dog may be fixed upon thesame and connection, made with the head stock spindle if power is to beutilized for rotating it.

The marker of my invention is arranged so that it may be inserted intoany standard tool post, and is held similar to the manner of holding anyof the usual cutting tools.

The marker is arranged so that it may be used in a longitudinaldirection, as for instance when the work is held by the head and tailstock spindles, or may be used in connection with a piece of work whichis ,held by the head stock spindle alone, .as for instance when a chuckis used; as will be hereinafter pointed out.

In the modification hereinafter referred to, I provide a scale similarto the scale used in the preferred embodiment of my invention, providedwith a frictionally held abutment arranged to cooperate with any one ofthe cutting tools employed for cutting the work, and thus eliminate theuse of a special marker. The operation of this modified construction issimilar in all'manners to the device above referred to, in that themovement of the same is controlled both longitudinally and transverselyof the lathe bed, by the carriage hand feeds.

My invention will be more clearly understood by referring to theaccompanying drawings in which Figure 1 is a perspective view of astandard lathe provided with the marker of my invention. The marker ishere illustrated positioned in the tool post, which is controlled by thecarriage hand feeds.

Fig. 2 is a perspective view of the marker.

Fig. 3 is a plan view of the device of my invention shown in positionfor operation, the work being here illustrated mounted upon the head andtail stock spindles.

Fig. 4 is a plan view of a portion of the head stock and a chuck carriedthereby. The marker illustrated in this figure is slightly modified,although the marker illustrated in Figs. 1 to 3 inclusive may here beused.

Fig. 5 is a perspective view of the end projection of a modified form ofscale which 7 may be employed.

Fig. 6 is another modified form of marker wherein a special marking toolis dispensed with, and

Fig. 7 is a perspective view of the abut ment member used ilrconiiectionwith the device illustrated in Fig. (3.

Similar reference characters refer to similar parts throughout theseveral views.

Referring first to Fig. 1, I have illustrated at 8 a lathe bed uponwhich is mounted the head stock 9 and the tail stock 10. The head andtail stocks are provided with the usual spindles 11 and 12 respectively.The head stock is provided with the usual pulleys, whereby power may betransmitted to the lathe. Connected by means of suitable gearing orbelting to the shaft of the pulleys carried by the head stock, are thefeed rod 13 and the lead screw 14. These, as is well known in the art,are arranged to be connected to the carriage 15 slidably mounted on thebed of the lathe. Slidably mounted on the upper surface of the carriage15 is the cross feed 16, upon which is mounted the tool post 17. Thistool post carries the usual handle 18 to facilitate the clamping andholding of the cutting tools. In the particular kind of lathe hereillustrated, the movement of the cross feed 16 is controlled by the handcrank 19 and a secondary crank 20, movement of either one causingrelative movement between the cross feed and the carriage. In additionto means for connecting the carriage to the lead screw and feed rod, thecarriage is provided with a longitudinal hand feed crank or wheel 21arranged when operated to cause longitudinal movement of the carriage.Rotation of the hand wheel 21 is transmitted to gearing contained withinthe carriage which mesh with a gear rack'illustrated at 22. It will beseen therefore, that the position of the tool post 17 is controlled bythe hand feeds 19, 20 and 21. v

1 Fig. 2 illustrates the marker of my invention which consists of asquared portion 23 arranged to be inserted into the slot provided in thetool post. The forward end of the marker carries a cutting edge 24 whichregisters with an index 25 provided on the upper face of the marker. 26illustrates a rectangular bore in which is slidably mounted the scale27. A spring is illustrated at 28 connected to one wall of the bore, forfrictionally holding the scale in any position to which it may be moved.The index 25 as illustrated, is positioned adjacent the opening 27,which permits the scale graduations to be set to register with theindex. One end of the scale 27 carries a projection 29,

adapted to engage some portion of the work,

is for instance, the end face as illustrated in The operation of thedevice thus far described is as follows :Let us assume that it isdesired to mark the work at the points illustrated at a, Z), 0, CZ, eand f. The marker 23 is first inserted into the tool post and se cuirelyheld therein by manipulating V the handle 18 to cause engagement of thescrew threaded post with the marker. The scale 27 is inserted into thebore 26 carried by the marker, and the tool post is moved by means ofthe hand feed control 21 to the extreme right hand end of the workillustrated in Fig. 3. The projection 29 is then moved into engagementwith the right hand end face of the work as illustrated in this figure.

After the scale is thus positioned, movement of the same is preventedtoward the head stock 9. Since the point a is one half an inch away fromthe right handend of the work, the hand feed 21 is turned until theindex 25 registers with the one half inch mark of the scale 27. Sincethe cutting edge 24 registers with the index, the cutting edge willtherefore be positioned one half inch away from the right hand end ofthe work. The position of the marker is therefore set. To effect themarking upon the work, the transverse or cross hand feed 19 or 20 isthen operated to cause engagement of the marking edge at with the work.After this engagement is had, the work is caused to rotate, either byhand or by power. When power is used, the usual dog 30 is fixed on tothe work and connection made with the head stock spindle 11. After themark a has been made, the tool post is moved away from the same byoperating the transverse hand feed,,whereupon movement of the tool posttoward the head stock may be again caused by the hand feed 21 until themarker is in position to effect the marking illustrated at b. Thisoperation is continued until the workis marked at all the positionsindicated.

The scale 27 is preferably provided with divisions on both sides so thatthe same may be inverted and the projection, 29' placed on the'headstock side of the work. After the scale is thus positioned, the toolpost 17 and thus the marker is moved in the opposite direction to'effectthe variousmarkings. It will readily be seen that the tool post may bemoved toward theprojection 29 0f the scale if suitable connectionis'made between the scale and work, or some portion of the lathe. Thisparticular connection can of course, be easily made, and I havetherefore thought it unnecessary to illustrate.

In Fig. 4 I have illustrated a chuck for holding the work shown at 31,in the form of a disk. The tool post carries the marker which slidablysupports the scale 27*. The marker here shown is slightly modified, inthat it carries an index projection 32 arranged to cooperate with thedivisions car ried by the scale. The cutting or marking edge 33 ispositioned adjacent the index 32 so as to register therewith. Theprojection 29 is arranged to abut against the end of the work 31 and theposition of the marker determined by the divisions carried by the scale.

In order to eflect positive engagement of the projection of the scalewith the work, at a point farthest away from the center thereof, theprojection may be provided with a vertically extending arm 34:illustrated in Fig. 5. It will readily be seen that this is accomplishedby means of the vertically extending arm whether the scale is positionedabove or below the center of the head stock spindle. The scale ofcourse, may here also be provided with divisions on both sides so thatthe projection may be arranged to engage either the front or rear edgeof the work. The dotted lines illustrated in Fig. 4 show the markerpositioned for operation when it is desired to have the projectionengage the front edge of the work.

Figs. 6 and 7 illustrate a marker in which the special cutting tool isdispensed with. In this figure the scale is illustrated at 27 and theprojection at 29 The scale 27 is slidably mounted in an abutment member35 which carries a spring 36 to cause frictional engagement between themember and the scale. As most clearly illustrated in Fig. 7, the member35 is provided with a downward projection 37 which serves as an abutmentarranged when in position for operation to engage the side face of acutting tool 38. This cutting tool may be any one of the many kinds ofcutting tools employed. In this figure I have illustrated a round nosetool. The graduations carried by the scale are preferably positioned asillustrated on the upper edge so that the position of the cutting toolrelative to the graduations may easily be determined. The operationofthe device illustrated 1n these figures will readily be apparent. Bymoving the tool post 17 movement of the abutment member 35 is alsocaused. This member 35 serves merely to hold the scale upon the cuttingtool.

Having thus described my invention what I claim is 1. A lathe toolcomprising in combination with a lathe and tool post therefor of amarker carried by the tool post, and a straight scale slidably supportedfrom the marker and extending horizontally therefrom along the edge ofthe work to be marked to designate the position of the marker relativeto a point on the work located horizontally away from the marker.

2. A lathe tool comprising in combination with a lathe and tool posttherefor of a marker carried by the tool post, a straight scale slidablysupported from the marker and extending horizontally therefrom along theedge of the work to be marked and a projection carried at one end of thescale arranged to engage one of the end faces of the work locatedhorizontally away from the marker to designate the position of themarker relative to the engaged end face of the work 3. A lathe toolcomprising in combination with a lathe and tool post therefor of amarker, and a straight scale having sliding connection with the markerand extending horizontally along the edge of the work to be marked todesignate the position of the marker relative to a point on the worklocated horizontally away from the marker, and devices for connectingone of said elements with the tool post.

4:. A lathe tool comprising in combination with a lathe and a tool posttherefor, a marker and a straight scale both supported by the tool postand slidable one with respect to the other, said scale being supportedin a plane parallel to the plane in which the tool post operates andextending along the edge of the work to be marked to designate theposition of the marker relative to a point on the work located away fromsaid marker.

In witness whereof, I hereunto subscribe my name this first day of May,A. D. 1915.

ROBERT F. BRACKE.

Witnesses:

A. G. MGCALEB, C. C. BRADBU'RY.

Copies of this patent may be obtained for five cents each, by addressingthe Gommissioner of Patents, Washington, D. G.

